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Título: Cell organisation, sulphur metabolism and ion transport-related genes are differentially expressed in Paracoccidioides brasiliensis mycelium and yeast cells
Autor(es): Matos, Larissa Fernandes
Andrade, Rosângela Vieira de
Paes, Hugo Costa
Nicola, André Morais
Carvalho, Maria José Albuquerque de
Fachin, Ana Lúcia
Cardoso, Renato Sousa
Silva, Simoneide Souza
Silva, Silvana Petrofeza da
Donadi, Eduardo Antônio
Sakamoto-Hojo, Elza Tiemi
Passos Júnior, Geraldo Aleixo da Silva
Soares, Célia Maria de Almeida
Brígido, Marcelo de Macedo
Felipe, Maria Sueli Soares
Assunto: Fungos
Micoses sistêmicas
Paracoccidioides brasiliensis
Data de publicação: 2006
Editor: BMC Genomics
Referência: FERNANDES, Larissa et al. Cell organisation, sulphur metabolism and ion transport-related genes are differentially expressed in Paracoccidioides brasiliensis mycelium and yeast cells. BMC Genomics, v. 7, n. 208, p. 1-13, 2006. Disponível em: <>. Acesso em: 12 nov. 2012.
Resumo: Background Mycelium-to-yeast transition in the human host is essential for pathogenicity by the fungus Paracoccidioides brasiliensis and both cell types are therefore critical to the establishment of paracoccidioidomycosis (PCM), a systemic mycosis endemic to Latin America. The infected population is of about 10 million individuals, 2% of whom will eventually develop the disease. Previously, transcriptome analysis of mycelium and yeast cells resulted in the assembly of 6,022 sequence groups. Gene expression analysis, using both in silico EST subtraction and cDNA microarray, revealed genes that were differential to yeast or mycelium, and we discussed those involved in sugar metabolism. To advance our understanding of molecular mechanisms of dimorphic transition, we performed an extended analysis of gene expression profiles using the methods mentioned above. Results In this work, continuous data mining revealed 66 new differentially expressed sequences that were MIPS(Munich Information Center for Protein Sequences)-categorised according to the cellular process in which they are presumably involved. Two well represented classes were chosen for further analysis: (i) control of cell organisation – cell wall, membrane and cytoskeleton, whose representatives were hex (encoding for a hexagonal peroxisome protein), bgl (encoding for a 1,3-β-glucosidase) in mycelium cells; and ags (an α-1,3-glucan synthase), cda (a chitin deacetylase) and vrp (a verprolin) in yeast cells; (ii) ion metabolism and transport – two genes putatively implicated in ion transport were confirmed to be highly expressed in mycelium cells – isc and ktp, respectively an iron-sulphur cluster-like protein and a cation transporter; and a putative P-type cation pump (pct) in yeast. Also, several enzymes from the cysteine de novo biosynthesis pathway were shown to be up regulated in the yeast form, including ATP sulphurylase, APS kinase and also PAPS reductase. Conclusion Taken together, these data show that several genes involved in cell organisation and ion metabolism/transport are expressed differentially along dimorphic transition. Hyper expression in yeast of the enzymes of sulphur metabolism reinforced that this metabolic pathway could be important for this process. Understanding these changes by functional analysis of such genes may lead to a better understanding of the infective process, thus providing new targets and strategies to control PCM.
Licença: This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (Attribution 2.0 Generic (CC BY 2.0). Fonte: Acesso em: 12 nov. 2012.
DOI: 10.1186/1471-2164-7-208
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